.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-size: var(--font-size-md);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(102, 217, 239, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background-color: rgba(102, 217, 239, 0.1);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: var(--font-size-lg);
}

.btn-link {
    color: var(--accent-primary);
    background: none;
    padding: var(--space-sm) 0;
    border: none;
    position: relative;
    font-weight: 600;
}

.btn-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-normal);
}

.btn-link:hover::after {
    width: 100%;
}

.btn-link i {
    margin-left: var(--space-sm);
    transition: transform var(--transition-normal);
}

.btn-link:hover i {
    transform: translateX(5px);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.theme-toggle .icon {
    stroke: var(--accent-primary);
    transition: stroke 0.3s ease;
}

.theme-toggle .sun,
.theme-toggle .sun-rays {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle .moon {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

body.light-theme .sun,
body.light-theme .sun-rays {
    opacity: 1;
    transform: scale(1);
}

body.light-theme .moon {
    opacity: 0;
    transform: scale(0.8);
}

body.dark-theme .sun,
body.dark-theme .sun-rays {
    opacity: 0;
    transform: scale(0.8);
}

body.dark-theme .moon {
    opacity: 1;
    transform: scale(1);
}